// This is part of Pico Library
// (c) Copyright 2004 Dave, All rights reserved.
-// (c) Copyright 2006 notaz, All rights reserved.
+// (c) Copyright 2007 notaz, All rights reserved.
// Free for non-commercial use.
// For commercial use, separate licencing terms must be obtained.
#include "../sound/sound.h"
-int counter75hz = 0;
+extern unsigned char formatted_bram[8*0x10];
int PicoInitMCD(void)
int PicoResetMCD(int hard)
{
- // clear everything except BIOS
- memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios));
- PicoMCD |= 2; // s68k reset pending
- counter75hz = 0;
+ memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
+ memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
+ memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
+ if (hard) {
+ memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
+ memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10);
+ }
+ memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
+ memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
+
+ *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
+ Pico_mcd->m.state_flags |= 2; // s68k reset pending
+ Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
+ Pico_mcd->m.counter75hz = 0;
LC89510_Reset();
Reset_CD();
+ gfx_cd_reset();
return 0;
}
int cyc_do;
SekCycleAim+=cyc;
if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
-#if defined(EMU_M68K)
+#if defined(EMU_C68K)
+ PicoCpu.cycles=cyc_do;
+ CycloneRun(&PicoCpu);
+ SekCycleCnt+=cyc_do-PicoCpu.cycles;
+#elif defined(EMU_M68K)
m68k_set_context(&PicoM68kCPU);
SekCycleCnt+=m68k_execute(cyc_do);
#endif
int cyc_do;
SekCycleAimS68k+=cyc;
if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
-#if defined(EMU_M68K)
+#if defined(EMU_C68K)
+ PicoCpuS68k.cycles=cyc_do;
+ CycloneRun(&PicoCpuS68k);
+ SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
+#elif defined(EMU_M68K)
m68k_set_context(&PicoS68kCPU);
SekCycleCntS68k+=m68k_execute(cyc_do);
#endif
}
-// TODO: tidy
-extern unsigned char m68k_regs[0x40];
-extern unsigned char s68k_regs[0x200];
+static __inline void check_cd_dma(void)
+{
+ int ddx;
+
+ if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
+
+ ddx = Pico_mcd->s68k_regs[4] & 7;
+ if (ddx < 2) return; // invalid
+ if (ddx < 4) {
+ Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
+ return;
+ }
+ if (ddx == 6) return; // invalid
+
+ Update_CDC_TRansfer(ddx); // now go and do the actual transfer
+}
+
+static __inline void update_chips(void)
+{
+ int counter_timer, int3_set;
+ int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
+
+ // 75Hz CDC update
+ if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
+ Pico_mcd->m.counter75hz -= counter75hz_lim;
+ Check_CD_Command();
+ }
+
+ // update timers
+ counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
+ Pico_mcd->m.timer_stopwatch += counter_timer;
+ if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
+ Pico_mcd->m.timer_int3 -= counter_timer;
+ if (Pico_mcd->m.timer_int3 < 0) {
+ if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
+ dprintf("s68k: timer irq 3");
+ SekInterruptS68k(3);
+ Pico_mcd->m.timer_int3 += int3_set << 16;
+ }
+ // is this really what happens if irq3 is masked out?
+ Pico_mcd->m.timer_int3 &= 0xffffff;
+ }
+ }
+
+ // update gfx chip
+ if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
+ gfx_cd_update();
+}
+
-// Accurate but slower frame which does hints
static int PicoFrameHintsMCD(void)
{
struct PicoVideo *pv=&Pico.video;
if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
}
+ check_cd_dma();
+
// H-Interrupts:
if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
{
sound_timers_and_dac(y);
// get samples from sound chips
- if(y == 32 && PsndOut)
- emustatus &= ~1;
- else if((y == 224 || y == line_sample) && PsndOut)
- ;//getSamples(y);
+ if (y == 224 && PsndOut) {
+ int len = sound_render(0, PsndLen);
+ if (PicoWriteSound) PicoWriteSound(len);
+ // clear sound buffer
+ sound_clear();
+ }
// Run scanline:
//dprintf("m68k starting exec @ %06x", SekPc);
+ if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
SekRun(cycles_68k);
- if ((Pico_mcd->m68k_regs[1]&3) == 1) { // no busreq/no reset
+ if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
#if 0
int i;
FILE *f = fopen("prg_ram.bin", "wb");
total_z80+=z80_run(z80CycleAim-total_z80);
}
- // if cdd is on, counter elapsed and irq4 is not masked, do irq4
- if ((Pico_mcd->s68k_regs[0x37]&4) && ++counter75hz > 209 && (Pico_mcd->s68k_regs[0x33]&(1<<4))) {
- counter75hz = 0;
- Check_CD_Command();
- }
+ update_chips();
}
// draw a frame just after vblank in alternative render mode